CN107277924A - Dynamic frequency multiplexing method based on type of service in a kind of LTE system - Google Patents
Dynamic frequency multiplexing method based on type of service in a kind of LTE system Download PDFInfo
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
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- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
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Abstract
The invention discloses the dynamic frequency multiplexing method based on type of service in a kind of LTE system, comprise the following steps：Step 1, Cell Center User and Cell Edge User are determined according to cell edge confining method, step 2, whole N bandwidth is distributed to Cell Center User, Cell Edge User distributes initial bandwidth Bb；Step 3, when the bandwidth B that base station section covers the user of fringe region meets regularization condition, and after the T2 times, condition is still met, is that Cell Edge User carries out Bandwidth adjustment.
Description
Technical field
The present invention relates to the dynamic frequency multiplexing method based on type of service in a kind of LTE system.
Background technology
LTE (Long Term Evolution, Long Term Evolution) is using OFDMA technologies (Orthogonal Frequency
Divided Multiple Access, orthogonal frequency-time multiple access technology), OFDMA technologies utilize the orthogonality between frequency to make
To distinguish the mode of user, the information of user is carried on mutually orthogonal different carrier waves, system is accomplished frequency
Multiplexing factor is 1, i.e., all cells in whole system coverage can use identical frequency band to be the user in this cell
Service is provided., can be in thing although the factors such as the skew due to carrier frequency and phase can cause the interference between subchannel
Reason layer is preferably minimized this interference by using advanced wireless signal Processing Algorithm.Therefore the interference very little in cell, and
Influence interference of the main interference from minizone of systematic function.
At present, the frequency reuse plan in LTE system mainly has partial frequency multiplexing (FFR, Fractional
Frequency Reuse), and soft-frequency reuse (SFR, Soft Frequency Reuse), SFR be divided into again basic model SFR and
Enhanced SFR.
1st, partial frequency multiplexing (FFR)
For LTE system, its unique OFDMA used access way so that between the user in this cell
It does not interfere with each other, and then receives for the user of cell edge and come from the stronger interference of other cells.Partial frequency multiplexing
Core concept be to treat with a certain discrimination the user in center of housing estate and cell edge, for the user of center of housing estate, due to
It is closer apart from base station distance, and channel condition is preferable, and interference to other cells itself is little, it is possible to distributed
In frequency duplex factor as one in 1 reuse set.And for the user of cell edge, its apart from the serving BS distance of itself compared with
Far, channel condition is poor, but the interference of its signal that identical frequency is in for other cells is larger, so being distributed in frequency
Rate multiplexing factor is on 3 channeling collection, as shown in Figure 1 (f1~f4 represents cell in figure).
Fixed frequency multiplex mode may include following two modes：
(1) 40MHz frequency spectrums are used, 4 10MHz frequency bands, the method for salary distribution is divided into, as shown in Fig. 2 wherein X is system work
Make the beginning frequency (same Fig. 2 of implication that the X in other accompanying drawings is represented) of frequency range.
The actual usable spectrum of each cell is 20MHz.Continuous 20MHz bandwidth can be used in two of which cell, and (f1+f2 is small
Area, f1+f3 cells), another cell can only use the 10MHz bandwidth (f1+f4 cells) of 2 separation.
(2) 20MHz frequency spectrums are used, inside is divided into 4 5MHz sub-bands, the method for salary distribution, as shown in Figure 3.
Each cell is under 20MHz frequency range, and cell edge low signal areas actual available bandwidth is 5MHz, Intra-cell
The actual usable spectrum of strong signaling zone is 10MHz.
2nd, soft-frequency reuse (SFR)
Soft-frequency reuse inherits the advantage of partial frequency multiplexing, while using dynamic frequency duplex factor as one, it is relatively brighter
The utilization ratio of frequency is improved aobviously.In soft-frequency reuse, all frequency ranges are divided into two groups of subcarriers, and one group is referred to as
Main subcarriers, another set is referred to as auxiliary subcarrier.Main subcarriers can be used from anywhere in cell, and auxiliary subcarrier then only
The heart it can be used in the cell.Main subcarriers between different districts are mutually orthogonal, and interference is restrained effectively in cell edge,
And auxiliary subcarrier disturbs smaller because only the heart is used in the cell, each other, then identical frequency can be used.
(1) basic model SFR
Under 20MHz bandwidth, 3 6.67MHz frequency bands are divided into as Main subcarriers, it is each for adjacent 3 cell edges
Use one；Each center of housing estate region is using 2/3 other frequency spectrum of this cell simultaneously, the method for salary distribution, as shown in Figure 4 (f1 in figure
~f6 represents cell).
In this manner, center of housing estate uses 2/3 usable spectrum, and cell edge uses 1/3 usable spectrum.
(2) enhanced SFR
Although soft-frequency reuse all there has been for the suppression of cell edge disturbed condition, and the flexible allocation of subcarrier
Certain consideration, but its mutually orthogonal Main subcarriers for distributing to different districts still can bring a certain degree of resource wave
Take, especially when the portfolio of cell edge is larger, the frequency duplex factor as one between cell can be brought to increase, the availability of frequency spectrum
The consequences such as decline.Enhanced soft-frequency reuse scheme inherits the thought of traditional soft-frequency reuse, and carries out on its basis
Improve, the problem of essentially consisting in the wasting of resources that improves and may be brought when portfolio changes.
Under 20MHz frequency spectrums, 3 frequency bands are divided into as Main subcarriers, while 20MHz frequency bands only exist as auxiliary subcarrier
Center of housing estate is used, (f1~f4 represents cell in figure) as shown in Figure 5.
Not only f2, f3, f4 occupied bandwidth are dynamically adjusted according to the portfolio of each cell edge region, big according to portfolio
Small, each center of housing estate region usable spectrum also can reach as 20MHz.
Modified SFR uses dynamic configuration mode, it is to be understood that the load information of peripheral cell, therefore needs and ICIC
(Inter Cell Interference Coordination, Inter-Cell Interference Coordination) technology is used cooperatively, can be only achieved good
Good effect.
The shortcoming of prior art and the technical problem to be solved：
The actual conditions of deployment of LTE network need to use dynamic frequency allocation scheme, but existing enhanced SFR is too
Complexity is, it is necessary to which coordination between base station, has been significantly greatly increased the complexity of antenna for base station and the amount of calculation of scheduler, while dynamic at present
The starting point of frequency allocation plan design is more based on lifting spectrum efficiency, reduction interference.But in network actual moving process,
Requirement of the different service types to network performance is different.3GPP (3rd Generation Partnership Project, the 3rd
For Partnership Program agreement) protocol definition conversation class, interactive class, stream class, background classes four class business, each business characteristic and to network
The requirement of performance is as follows：
(1) session service
Typical session service is speech business, is characterized in that end-to-end time delay is small, portfolio up-downgoing is symmetrical or several
It is symmetrical.In order to ensure the time delay and delay variation index of speech class business, the mapping of such business is generally turned into highest preferential
Level, and be its reserved bandwidth.
(2) interaction service
It is the business that terminal user's (people or machine) and remote equipment (such as remote server) carry out online data interaction, it is special
Point is request response modes.The time delay of interaction service depends on people for the tolerance of stand-by period, compares session service
Grow, but may be shorter than stream class service.
(3) stream class service
Stream class service is real-time, but due to being one-way transmission, it is not necessary to interact, so requirement of real-time does not have
Session service is so strict.
(4) background business
Mainly include some automatic backstage E-mail receptions, SMS or receive some files and database download.It is this kind of
The characteristics of business is that user is not required particularly transmission time, but the requirement to packet loss is very high.
All kinds of business have corresponding typical case to apply and qos requirement, and existing dynamic frequency allocation scheme, it is impossible to according to
Above-mentioned business characteristic and qos requirement, carry out the effective guarantee of resource.Therefore reasonable coordination spectrum efficiency and implementation complexity are needed
On the premise of, propose the dynamic frequency allocation scheme with type of service supportability.
The content of the invention
It is an object of the present invention to which there is provided dynamic based on type of service in a kind of LTE system in view of the shortcomings of the prior art
State frequency multiplexing method, can provide based on business characteristic, provide QoS (Quality of Service, service quality) property
While ensureing, the interference of LTE network edge customer is effectively reduced.
The present invention comprises the following steps：
Step 1, Cell Center User and Cell Edge User are determined according to cell edge confining method,
Step 2, whole N bandwidth is distributed to Cell Center User, Cell Edge User distributes initial bandwidth Bb；
Step 3, when the bandwidth B that base station section covers the user of fringe region meets regularization condition, and the T2 times are passed through
Afterwards, condition is still met, is that Cell Edge User distributes corresponding bandwidth.
Step 1 comprises the following steps：
Step 1-1, user is calculated to base station apart from L by equation below：
Wherein, (a, b) is the position coordinates of base station, and (c, d) is the position coordinates of user,
Step 1-2, given threshold M, when L is less than or equal to M, judge that user is located at the central area that base station section is covered,
For Cell Center User, otherwise judge that user is located at fringe region, be Cell Edge User；
Step 1-3, when customer location changes, is changed into (c1, d1) when, by lag time T1, (operator can be voluntarily
Set T1 value) after, customer location is changed into (c2, d2), if within the T1 times position of user changing value, i.e.,Be consistently less than the 1/10 of base station section covering radius, or less than by operator according to the network coverage
During other numerical value that situation is voluntarily determined, step 1-1~step 1-2 is performed, judges user as Cell Center User or cell
Edge customer.
In step 2, the setting network list a width of N of carrier frequency band, cell structure is omni-base station or three sector base stations, to cell
Central user distributes whole N bandwidth, and Cell Edge User distributes initial bandwidth Bb。
Step 3 comprises the following steps：
Step 3-1, the equivalent business throughput S of whole business in single cell is calculated by equation below：
S=Hh*I1+Jh*I2+Lm*I3+Bj*I4,
Wherein, Hh、Jh、Lm、BjThe handling capacity of session service, the handling capacity of interaction service, stream in respectively single cell
The handling capacity of class business and the handling capacity of background business, I1、I2、I3、I4The weighting system of session service in respectively single cell
The weight coefficient of number, the weight coefficient of interaction service, the weight coefficient of stream class service and background business, I1、I2、I3、I4Four
Individual weight coefficient sum is 1.For this four weight coefficients, numerical value is higher, then represents ratio of the business in equivalent portfolio
It is again bigger, on the contrary it is smaller.For the equivalent portfolio of the reality for reflecting all kinds of business in single cell, without differentiated service type, I1、
I2、I3、I4This four parameter value suggestions take identical numerical value, i.e., 0.25；
Step 3-2, takes S certain proportion, is used as threshold value Sm：
Sm=S* η,
Wherein, η is proportionality coefficient；
Step 3-3, the equivalent business throughput S of Cell Edge User is calculated by equation belowb：
Sb=Hby*I5+Jby*I6+Lby*I7+Bby*I8,
Wherein, Hby、Jby、Lby、BbyRespectively the handling capacity of Cell Edge User session service, interaction service are gulped down
The handling capacity of the amount of telling, the handling capacity of stream class service and background business, I5、I6、I7、I8Respectively Cell Edge User conversation class
The weight coefficient of business, the weight coefficient of interaction service, the weight coefficient of the weight coefficient of stream class service and background business,
Wherein I5≥I1, I6≥I2, I7≥I3, I8≥I4, concrete numerical value by operator according to network need the type of service of priority support from
Row setting.For conversation class, interactive class, stream class and background classes this four classes business, its requirement to network performance is reduced successively.By
In session service to performance index requirements highest, it is necessary to ensure first, therefore its weight coefficient I5Numerical value add more than other
Weight coefficient, i.e. I5≥I6≥I7≥I8；
Step 3-4, as the equivalent business throughput S of Cell Edge UserbMeet regularization condition, i.e. ROUND (Sb/Sm) be more than
Tune is still met equal to 1, and after lag time T2 (T2 value can be set to 10s, or by operator's sets itself)
Shelf-regulating Conditions, then be adjusted according to equation below to the bandwidth B of Cell Edge User：
B=Bb*(ROUND(Sb/Sm)+1),
Wherein, ROUND () is round function, as ROUND (Sb/Sm)=(N/Bb) -1, i.e. BbDuring=N, bandwidth
Adjustment terminates.
Beneficial effect：
The present invention has following technological merit：
1st, dynamic adjustment frequency spectrum
This programme can be according to all kinds of business throughput distribution situations in central area and fringe region in base station section
Dynamic adjustment frequency spectrum so that the business higher to performance index requirements such as conversation class, interaction service are distributed in cell edge area
When domain distribution is more, system has been given distributes more frequency spectrums for Cell Edge User, and the business of lifting cell edge region is handled up
Amount, lifting user perceives；The fringe region business higher to the performance index requirements such as conversation class, interaction service in network cell
Be distributed in cell edge region distribution it is less many when, distribute less frequency spectrum, reduce the interference to other cells.
2nd, implementation complexity is low
Compared with enhanced SFR needs many base station Coordination Treatments, this programme only needs to consider the business throughput of this cell
Distribution situation, it is not necessary to consider the Network distribution situation of adjacent cell, therefore this programme implementation complexity is relatively low, to network
Change it is less.
3rd, network O＆M is convenient
This programme is realized simple, and each base station only needs to collect, monitor the distribution situation of this intra-cell traffic, base station it
Between need not cooperate with, any parameter need not be changed under newly-increased base station, resettlement base station etc. network change conditions, network O＆M is non-
It is often convenient.
Brief description of the drawings
The present invention is done with reference to the accompanying drawings and detailed description and further illustrated, it is of the invention above-mentioned or
Otherwise advantage will become apparent.
Fig. 1 is partial frequency multiplexing schematic diagram.
Fig. 2 is partial frequency multiplexing dividing mode (one).
Fig. 3 is partial frequency multiplexing dividing mode (two).
Fig. 4 is basic model soft-frequency reuse.
Fig. 5 is enhanced soft-frequency reuse.
Fig. 6 is the dynamic frequency multiplexing scheme (omni-base station) based on type of service.
Fig. 7 is the dynamic frequency multiplexing scheme (three sector base stations) based on type of service.
Fig. 8 is the dynamic frequency multiplexing scheme based on type of service.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
(1) solution principle
In the coverage of base station section, it is to be located at base that this user can be judged according to the distance between user to base station
Stand the central area of sector covering, shown in or fringe region, such as formula (1).A threshold values is set, threshold values can be according to system
Simulative optimization is obtained or operator's sets itself.When being less than threshold values such as the distance between user and base station, it is believed that the user is located at
The central area of base station section covering, it is on the contrary, then it is assumed that the user is located at the fringe region that base station section is covered.
Wherein：(a, b) is the position of base station, and (c, d) is the position of user, and L is distance of the user to base station.
User for covering central area positioned at base station section, does not differentiate between its type of service (conversation class, interactive class, stream
Class, background classes), all frequency spectrum resources of user are distributed to, to increase sector entire throughput.Positioned at base station section edge
The user in region, according to its type of service (conversation class, interactive class, stream class, background classes), carries out certain Equivalent Calculation, and according to
According to the result of Equivalent Calculation, dynamic spectrum adjustment is carried out, so that in base station coverage sector fringe region, while carrying high net
The user of network performance requirement business, can distribute more frequency spectrum, so as to effectively provide the QoS performance guarantees of business, carry
User is risen to perceive.In base station coverage sector fringe region, in the case of the business of the high network performance guarantee of user's carrying is less, distribution
Less frequency spectrum, so that the interference to other cells is reduced, so as to the overall spectral efficiency of lifting system.
(2) scheme is described in detail
The expected network list a width of N of carrier frequency band, cell structure can be that omni-base station or three sector base stations (are shown in signal respectively
F1~f2 represents cell in Fig. 6 and Fig. 7, figure).
Base station section covers the confining method of central area and fringe region：Optimized with system simulation on obtaining or runing
The numerical value of sets itself is as threshold value, and the value is fixed tentatively as M, and the result L calculated according to formula (1) is as reference, when L is less than etc.
When M, it is believed that on the contrary this user is located at the central area that base station section is covered, then think, it is believed that the user is positioned at fringe region.
When customer location changes, lag time T1 need to be passed through, the position of user remains at model after change within the T1 times
In enclosing, system accordingly changes user property.
The definition of the equivalent portfolio of cell based on type of service and computational methods：So that in single cell, user's is not of the same trade or business
The sum of products of service type (conversation class, interactive class, stream class, background classes) business throughput and its weight coefficient is used as equivalent business
Handling capacity, its calculation formula is such as shown in (2).
S=Hh*I1+Jh*I2+Lm*I3+Bj*I4 (2)
Wherein：
S is the equivalent business throughput of cell；
Hh、Jh、Lm、BjRespectively conversation class, interactive class, stream class and background business handling capacity；
I1、I2、I3、I4Respectively conversation class, interactive class, stream class and background business weight coefficient.
Herein, I1、I2、I3、I4Four weight coefficient sums are 1, when the equivalent business throughput of the full cell of calculating, I1、
I2、I3、I4Numerical value be defined as 0.25 or by operator's sets itself.In calculation base station sector, fringe region is equivalent gulps down for covering
During the amount of telling, Sb=Hby*I5+Jby*I6+Lby*I7+Bby*I8, wherein Hby、Jby、Lby、BbyAnd I5、I6、I7、I8, it is followed successively by base station fan
Area covers the portfolio and weight coefficient of conversation class, interactive class, stream class and the background business of fringe region.For I5、I6、I7、
I8This four parameters, it is desirable to I5≥I1, I6≥I2, I7≥I3, I8≥I4, concrete numerical value needs emphasis to protect by operator according to network
The type of service sets itself of barrier.For conversation class, interactive class, stream class and background classes this four classes business, it is to network performance
It is required that reducing successively.Due to session service to performance index requirements highest, it is necessary to ensure first, therefore its weight coefficient I5's
Numerical value is more than other weight coefficients, i.e. I5≥I6≥I7≥I8.In order to ensure the high performance index requirements such as conversation class and interactive class
QoS, in real network operation, can suitably increase I5And I6Numerical value.
Present invention setting：
S is the equivalent business throughput of whole business in single cell, takes S certain proportion (η), is used as threshold value Sm(Sm=
S* η), η numerical value can be set by operator according to service operation situation and the requirements of support.
The equivalent business throughput S of Cell Edge Userb, it is defined as in base station section covering fringe region user not
The sum of products of same type of service (conversation class, interactive class, stream class, background classes) business throughput and its weight coefficient, its is specific
Computational methods are shown in formula (2).
The bandwidth original allocation of the user of base station section covering fringe region is Bb(a width of N of overall system, and N is BbIt is whole
Several times), when base station section covers the equivalent business throughput S of user of fringe regionbChange, according to formula (3), to base station
The bandwidth B of the user of sector covering fringe region is adjusted, as ROUND (Sb/Sm)=(N/Bb) -1, i.e. BbDuring=N, bandwidth
Adjustment terminates.
B=Bb*(ROUND(Sb/Sm)+1) (3)
Wherein：ROUND (X) is round function, such as ROUND (1.2)=1, ROUND (2.6)=3.
In order to prevent the appearance of " ping-pong ", when the bandwidth B that base station section covers the user of fringe region meets adjustment
, it is necessary to which by lag time T2, the bandwidth B of the user of base station section covering fringe region still meets tune within the T2 times during condition
Shelf-regulating Conditions, then system is that fringe region user increases/reduced B bandwidth.
System processing unit：I.e. LTE system is used for distributing the system module of bandwidth for fringe region user, can be in base station
In increase newly corresponding module, can also be integrated in BBU (Building Base band Unit, baseband processing unit) equipment.
Scheme running：During initial launch, system processing unit determines center of housing estate according to cell edge confining method
User and Cell Edge User, whole N bandwidth is distributed to Cell Center User, and Cell Edge User distributes initial bandwidth Bb.When
When the bandwidth B of the user of base station section covering fringe region meets regularization condition, and by the T2 times, still meeting condition, then
The bandwidth demand calculated according to formula (3), system processing unit is that base station section covers user's distribution of fringe region accordingly
Bandwidth；By that analogy until system processing unit gives Cell Edge User distribution whole N bandwidth.
Embodiment
Assuming that certain all base station of operator's LTE network uses three sector mode networkings, its spectral bandwidth is 20MHz；With small
The 1/2 of area's covering radius is determined with for for center of housing estate zone user or fringe region user according to formula (1) as thresholding.
Lag time T1 is 5s.Conversation class in cell, interactive class, stream class, the handling capacity of background business be followed successively by 4Mbps, 6Mbps,
8Mbps, 6Mbps, its weight coefficient are 0.25, then the equivalent business throughput of single cell is S=4*0.25+6*0.25+8*
0.25+6*0.25=6Mbps, adjustment proportionality coefficient η value are 0.1, then Sm=S* η=0.6Mbps.Covered for base station section
The conversation class of the user of lid fringe region, interactive class, stream class, the weight coefficient of the handling capacity of background business be followed successively by 0.4,
0.3、0.25、0.25.Initial bandwidth BbFor 2MHz；Lag time T2 is 10s；System processing unit is integrated in BBU.For letter
Change analysis, the present embodiment is thought during whole system is runed, the handling capacity of all kinds business keeps constant, simply in base
Moved in sector coverage of standing, so as to influence the equivalent handling capacity of business of fringe region.
Scheme running is following (refer to f1, f2 in Fig. 8, figure and represent cell)：
During initial launch, BBU distributes 20MHz bandwidth, Cell Edge User distribution 2MHz bandwidth to Cell Center User；
When the conversation class of Cell Edge User, interactive class, stream class, background classes business throughput become successively turn to 2Mbps,
1Mbps, 3Mbps, 2Mbps, then Sb=2*0.4+1*0.3+3*0.25+2*0.25=2.35Mbps, and duration exceedes
During 10s, BBU is to a width of B=B of band that Cell Edge User is distributedb*(ROUND(Sb/Sm)+1)=2* (ROUND (2.35/0.6)+
1)=2* (4+1)=10MHz bandwidth；
3Mbps, 1Mbps, 3Mbps, 3Mbps are turned to when all kinds of business throughputs of Cell Edge User become successively, then Sb=
3*0.4+1*0.3+3*0.25+3*0.25=3Mbps, and duration more than 10s when, BBU give Cell Edge User distribution
The a width of B=B of bandb*(ROUND(Sb/Sm)+1)=2* (ROUND (3/0.6)+1)=2* (5+1)=12MHz bandwidth；
1Mbps, 1Mbps, 0.5Mbps, 0.5Mbps are followed successively by when all kinds of business throughputs of Cell Edge User change, then
Sb=1*0.4+1*0.3+0.5*0.25+0.5*0.25=0.95Mbps, and duration more than 10s when, BBU gives cell side
The a width of B=B of band of edge user distributionb*(ROUND(Sb/Sm)+1)=2* (ROUND (0.95/0.6)+1)=2* (2+1)=6MHz
Bandwidth；
3Mbps, 4Mbps, 6Mbps, 4Mbps are followed successively by when all kinds of business throughputs of Cell Edge User change, then Sb=
3*0.4+4*0.3+6*0.25+4*0.25=4.9Mbps, and duration more than 10s when, BBU is to Cell Edge User point
The a width of B=B of band matched somebody with somebodyb*(ROUND(Sb/Sm)+1)=2* (ROUND (4.9/0.6)+1)=2* (8+1)=18MHz bandwidth.
The invention provides the dynamic frequency multiplexing method based on type of service in a kind of LTE system, the skill is implemented
The method and approach of art scheme are a lot, and described above is only the preferred embodiment of the present invention, it is noted that led for this technology
For the those of ordinary skill in domain, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these
Improvements and modifications also should be regarded as protection scope of the present invention.Each part being not known in the present embodiment can use prior art
Realized.
Claims (4)
1. the dynamic frequency multiplexing method based on type of service in a kind of LTE system, it is characterised in that comprise the following steps：
Step 1, Cell Center User and Cell Edge User are determined according to cell edge confining method；
Step 2, whole N bandwidth is distributed to Cell Center User, Cell Edge User distributes initial bandwidth Bb；
Step 3, when the bandwidth B that base station section covers the user of fringe region meets regularization condition, and after the T2 times, still
Condition is met, is that Cell Edge User carries out Bandwidth adjustment.
2. the dynamic frequency multiplexing method based on type of service in a kind of LTE system according to claim 1, its feature exists
In step 1 comprises the following steps：
Step 1-1, user is calculated to base station apart from L by equation below：
<mrow>
<mi>L</mi>
<mo>=</mo>
<msqrt>
<mrow>
<mo>(</mo>
<msup>
<mrow>
<mo>(</mo>
<mrow>
<mi>c</mi>
<mo>-</mo>
<mi>a</mi>
</mrow>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<mrow>
<mi>d</mi>
<mo>-</mo>
<mi>b</mi>
</mrow>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>)</mo>
</mrow>
</msqrt>
<mo>,</mo>
</mrow>
Wherein, (a, b) is the position coordinates of base station, and (c, d) is the position coordinates of user,
Step 1-2, given threshold M, when L is less than or equal to M, judges that user is located at the central area that base station section is covered, are small
District center user, otherwise judges that user is located at fringe region, is Cell Edge User；
Step 1-3, when customer location changes, is changed into (c1, d1) when, if after lag time T1, customer location is changed into
(c2, d2), if within the T1 times position of user changing value, i.e.,It is consistently less than base station section
The 1/10 of covering radius, performs step 1-1~step 1-2, judges user as Cell Center User or Cell Edge User.
3. the dynamic frequency multiplexing method based on type of service in a kind of LTE system according to claim 2, its feature exists
In in step 2, the setting network list a width of N of carrier frequency band, cell structure is omni-base station or three sector base stations, to center of housing estate
User distributes whole N bandwidth, and Cell Edge User distributes initial bandwidth Bb。
4. the dynamic frequency multiplexing method based on type of service in a kind of LTE system according to claim 3, its feature exists
In step 3 comprises the following steps：
Step 3-1, the equivalent business throughput S of whole business in single cell is calculated by equation below：
S=Hh*I1+Jh*I2+Lm*I3+Bj*I4,
Wherein, Hh、Jh、Lm、BjThe handling capacity of session service, the handling capacity of interaction service, stream class industry in respectively single cell
The handling capacity of business and the handling capacity of background business, I1、I2、I3、I4The weight coefficient of session service in respectively single cell,
The weight coefficient of the weight coefficient of interaction service, the weight coefficient of stream class service and background business, I1、I2、I3、I4Four
Weight coefficient sum is 1；
Step 3-2, takes S certain proportion, is used as threshold value Sm：
Sm=S* η,
Wherein, η is proportionality coefficient；
Step 3-3, the equivalent business throughput S of Cell Edge User is calculated by equation belowb：
Sb=Hby*I5+Jby*I6+Lby*I7+Bby*I8,
Wherein, Hby、Jby、Lby、BbyRespectively the handling capacity of Cell Edge User session service, the handling capacity of interaction service,
The handling capacity of stream class service and the handling capacity of background business, I5、I6、I7、I8Respectively Cell Edge User session service
Weight coefficient, the weight coefficient of interaction service, the weight coefficient of the weight coefficient of stream class service and background business, wherein I5
≥I1, I6≥I2, I7≥I3, I8≥I4, and I5≥I6≥I7≥I8；
Step 3-4, as the equivalent business throughput S of Cell Edge UserbMeet regularization condition, i.e. ROUND (Sb/Sm) be more than or equal to
1, and pass through lag time T2, regularization condition is still met, then the bandwidth B of Cell Edge User is adjusted according to equation below
It is whole：
B=Bb*(ROUND(Sb/Sm)+1),
Wherein, ROUND () is round function, as ROUND (Sb/Sm)=(N/Bb) -1, i.e. BbDuring=N, Bandwidth adjustment
Terminate.
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